DEVICE FOR MEASUREMENT OF SPACE VELOCITY OF AIR FLOW AT BREATHING Russian patent published in 2003 - IPC

FIELD: procedure of diagnosis of space velocity of ventilation function by the method of spirometry. SUBSTANCE: the device has a cylindrical air conduit with inner and outer tubes adjoining one another. The first of them is made with through holes for air intake, and the other - with two connections for air discharge connected by hoses to the air flow sensor. The aerodynamic element in the form of a disk with slots is located inside the first tube. Two annular grooves are made on the outer surface of this tube, they are spaced at equal distances relative to the plane of disk arrangement. The through holes are positioned uniformly in each groove along the circumferences being in the planes equidistant from the plane of disk arrangement. The planes passing through the axes of symmetry of the connections perpendicularly to the axis of the tubes are located between the boundaries of the respective annular grooves at equal distances from the disk plane. The distance between each plane and the boundaries of the groove exceeds the inner radius of the connection. The air flow at its motion through the air conduit is not subjected to the actions resulting in appearance of turbulence and random variations of velocity. The detability of the construction makes it possible to easily clean the holes and other members of the air conduit. EFFECT: enhanced accuracy and reliability of measurement. 2 dwg